Is `cmd.CommandType = CommandType.StoredProcedure;` Necessary When Executing Stored Procedures in C#?

Setting CommandType on SQL Commands: StoredProcedure vs. Text

When utilizing stored procedures in C#, it's common to encounter code like the following:

string sql = "GetClientDefaults";

SqlCommand cmd = new SqlCommand(sql);
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@computerName", computerName);

However, the question arises: Is the line cmd.CommandType = CommandType.StoredProcedure; necessary, and what are the potential implications of not using it?

Performance Considerations

According to performance tests, SQL Server performs parameterization regardless of whether you use CommandType.Text or CommandType.StoredProcedure. However, when using CommandType.StoredProcedure, the parameterization is done more efficiently by SQL Server. This results in a speed advantage for using CommandType.StoredProcedure.

Parameter Declarations

When using CommandType.Text, it's crucial to include the parameter names in the CommandText itself. This is because the sp_executesql wrapper, which is used by SQL Server to parameterize the statement, doesn't automatically pass the parameter names. Therefore, you must manually specify them to ensure proper execution.

For example, if you create a procedure like this:

create procedure dbo.Test
(
   @Text1 varchar(10) = 'Default1'
  ,@Text2 varchar(10) = 'Default2'
)
as
begin
   select @Text1 as Text1, @Text2 as Text2
end

And then call it using CommandType.Text, you must include the parameter names in the CommandText:

string callText = "dbo.Test @Text1, @Text2";

Otherwise, you will encounter an error indicating that the specified parameter was not supplied.

Conclusion

In summary:

• For optimal performance, use CommandType.StoredProcedure when executing stored procedures.
• When using CommandType.Text, be mindful of parameter declaration in the CommandText.

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